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We do control player name changes. The problem was just that we allow a player update on login/logout; the reason for that, as far as I recall, was that if you play with a reserved nickname, you'd only be allowed to take it after you authenticate; there's a delay between entering the server and authenticating properly, but you'd want to be renamed from 'fake free kill' to 'free kill' ASAP. Well, I removed those updates, hoping there was no other, more important reason. Nobody is reserving nicknames anyway.